Incremental Computing, including: Comma-separated Values, Symbolic Link (sylk), Data Interchange Format, Csv Application Support, Fielded Text, ... Sheetster, Irows, Editgrid, Google Docs

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More info: Incremental computing, also known as incremental computation, is a software feature which, whenever a piece of data changes, attempts to save time by only recomputing those outputs which "depend on" the changed data. For example, a spreadsheet software package might use incremental computation in its recalculation feature, to only update those cells containing formulas which depend (directly or indirectly) on the changed cells.